Centrifugal process.



T. A. BRYSON. (JENTRiFUGAL PROCESS.

APPLICAHON FILED MAR. 2|. I918.

Patented Oct. 1, 1918.

pg ,WZ' flM I 5 jgftar'ng/ UNITED STATES PATENT OFFICE.

TANDY A. nnYsoN, or minor, NEW YORK, assmnoa TO 'ronnons'r macnmn worms,

A CORPORATION 01' NEW YORK.

omrrarruear. rnocsss.

Specification of Letters Patent.

Patented Oct. 1, 1918.

Original application flied November 28, 1914, Serial No.'874,487.Div1ded and this application flied March ,21, 1918. Serial No, 223,760.

To all whom it may concern:

'nutely comminuted materials, such for instance as clays, linseed oilfoods, apple skins, and other substances, which under centr fugal actionpass into a dense or impervious layer; this application being a divisionof my application Ser. No. 874,487, filed November 28, 1914.

The objects and advantages of the invention will be set forth in parthereinafter, and in art will be obvious herefrom, or may be earned bypractice with the invention.

The accompanyin drawings, referred to herein and constituting a parthereof, illustrate in part the invention, and together with thedescription serve to explain the principles thereof;

Of the drawings: Figure 1 is a vertical section on the hue A-B of Fig.2; and

Fig. 2 is a full horizontal section on line G-D of Fig. 1.

In the usual manner of filtering or dewaterin' most materials bycentrifugal action, a boring medium or instrumentality is placed at theperipvhgral walls of the cylindrical container. on two or more materialsof different specific gravity are centrifuged, the heavier material,usually a solid, will take its position ina layer upon the verticaleripheral'wall of the container and the lig ter material, usually aliquid,

will take its osition in a layer within, such outer and re atively denselayer.

. comminuted,

The dewatering is thus prevented or ren tiered economically inefficient.

By my invention the impervious layer of clay, or other finely dividedorotherwise impervious materials, is allowed to build up in thicknessabout'the periphery, and a continuous drainage of the separated liquidlaiyer from the interior surface of the gradua 3 material is maintained,the drainage being maintained in uniform and constant relation to theinner surface of the layer notwithstandin its increase in thickness andconsequent c iange in position. My invention rovides also for acontinuous straining or ltering of the intermediate stratum or layerwhich is in intermediate state or condition between the liquid and thesolid layers, and which is partly dewatered, and thereby is somewhatcondensed, but which is not yet closely compacted into the condition ofthe dense and impervious outer layer, this action being maintainedlikewise irrespective of the gradual change in the thickness of theperipheral layer.

By one feature of my invention also, means are provided for removing therelatively slight amount of retained moisture which can be drained fromthe outer layer of solid material, if permitted to do so, by thepressure of the centrifugal action, as the com acting action oroperation passes into its nal stages.

By my invention, the filtering surface or moisture tapping device ispositioned or extended in a general radial direction beyond or withinthe layer of denser and heavier material in the centrifugal machine tobring such surface or device into direct communication with the innerlayer of'liquid, and this liquid may then be carried or flowed awaywithout passing through the outer and denser layer. By the action ofcentrifugal force, the inner wall or surface of the dense outer materialwill be in effect a level surface, and the liquid will be free to flowover it in a circumferential direction to an moi). structed outlet.

thickening and building layer of solid 105. Thus the material isquiqklydewatered and, the: work; quickly, thoroughly. economic or V In theembodied form of mechanimi, and referrin to Fi 2, a bowl or container .1has vertical cylindrical side walls 2 and a bottom 3, and is preferablypartly open at the top having an inwardly extending ring or annularplate and also may have a suitable closure if desired. The shaft forrotating the basket or container passes through the opening 5. Theinvention is herein upplied to an intermittently operated centrifugalthat is, one which is stopped. to unload and load, although in certainof its features the invention is applicable to other kinds of machines.In the embodied form, the interior is lar ely unobstructed aflordinggreat facility or loading and unloading.

A tapping or filtering device for flowing off. the inner liquid layer,as already described, is provided. In the embodied form thereof, avertically arranged wall 8 is fixed to the wall '2 of the bowl orcontainer and is angled or returned back again to the wall 2, beingpreferably of V shape in horizontal section with the upper ends joiningthe pei'iphery of the basket or container. There are preferably aplurality of the tappin or filtering devices 8, and they may be bo tedor otherwise suitably fastened to the wall 2. Wall 8 is provided withopenings for the filtering or passing through of the liquid. As embodiedthere are perforations 9 in the wall 8, and over the wall 8 is stretchedor spread a sheet or layer 10 of wire gauze or other suitable foraminousmaterial. The liquid is carried off from the other side of wall 8 bysuitable -means and for this purpose the wall 2 is preferably madeperforate where inclosed by 8, as shown at 11. The

liquid will thus flow in a circumferential di- -rection through theopenings in 8 and will then be thrown out by centrifugal action throughthe openings at 11.

It will thus be seen, as previously indicated, that the inner layer ofliquid will be drained ofl and that there is a concurrent filtering,through the gauze 11, of the partly deliquidized, and thereb partly conensed or compacted material w 'ch exists intermediate or between theseparated liquid at the interior and the impervious layer at theexterior, and that these two operations will continue unimpeded as thelayer of compacted material builds up or becomes thicker as the processproceeds. That is, there is maintained a combined drainage of the clearliquid and a filtering or straining of the intermediate mixed liquidcontinuously from just within the impervious layer as that layer buildsup. The conditions of deliquidizing are thus maintained in a constant oruniformly efficient state throughout the changing operation, producing auniformly and (o g e substantially entirely dried mass as the finalresultof the process.

"Thehporation will continue, as indicated,- u'u'til the entire mass isentirely deliquidiz ed and-compacted, and there will not be a re 7 sid 1of sludge or partly deliquidized materia at the end of the operation.

While the outer layer is impervious to the passage of liquidiherethrough, there is a very slight amount of moisture left between 71the particles of the relatively solid or comacted mass, and this as itis further sub- Jected to the pressure of the centrifugal action isdrained 05 through the outlets of the members 8, and as this drainageproceeds this final degree of moisture is gradually gotten rid of,leaving a compact and umformly dry mass in the centrifugal.

In addition to the improved and advantageous way of treating thematerial and effecting the drying or dewatering, the mechanism is ofsimple form and requires no e-neral changes in the usual form of centriugal basket or container. It nay also be easily and quickly applied toand removed from existing baskets, thus permitting the use of a singlebasket or container for different kinds of work and materials. here thewalls of a basket or container are perforate, the wall 2 may be aninserted thin inner wall of sheet metal. The mechanism is simple andinexpensive, and the greater part of the interior of the basket is leftunobstructed for loading and unloading and for cleaning.

The invention in its broader aspects is not limited to the precise formshown and described, but variations may be made therein withoutdeparting from the principles of the invention and without sacrificingits 10! chief advantages.

What I claim is 1. The process of centrifugal deliquidizing whichcomprises subjecting to centrifugal action a mixture of finely divided 1impervious material in suspension in a liquid and thereby forming andretaining a gradually thickening outer layer of the impervious materialseparated out of the solution and simultaneousl draining off theseparated liquid from ust withinthe impervious layer and so maintaininsaid drainage continuously from just within said outer layer as itbuilds up, and continuing said actions until substantially all the liquiand solid are separated from each other.

2. The process of centrifugal deliquidizing which comprises subjectingto centrifugal action a mixture of finely divided impervious material insuspension in a liquid and thereby forming and retainin a graduallythickening outer layer of tlie impervious material separated out of thesolution and simultaneously drainin off the sepvarated liquid from justwi in the impervious layer and so maintaining said drainage continuouslyfrom just within said outer layer as it bllllClS up, and simultaneouslyand continuously filtering ofl'li uid from the artl deliquidized andthere ya partly con enset mixture which is intermediate the imperviousouter layer and the inner liquid layer.

3. The process of centrifugal deliquidizp ing which comprises subjectingto centrifugal action a mixture of finely divided impervious material insuspension in a liquid and thereby forming and retainln a gradu allythickening outer layer of tie imperviousvmaterial separated out of thesolution and simultaneously draining off the separated liquid from justWithin the impervious layer and so maintaining said drainagecontinuously from just within said outer layer as it builds up, andsimultane ouslydraining the sli ht residual moisture from the imperviousayer by the centrifugal pressure.

st. The process of centrifugal separation which comprises subjecting amixture of finely divided insoluble and impervious material insuspension in a liquid to centrifugal action and thereby raduallybuilding up an outer layer of tie separated impcrvious material andcontinuously maintaining a combined drainage of t 0 clear liquid and astrainin of the mixed and partly condensed liquid within and incontinuing uniform relation to the impervious layer as that layer buildsup. i

5. The process of centrifugal deliquidizing which com rises subjecting amixture of finely divide impervious material in suspension in a liquidand thereby forming and retaining a gradually thickening cylindricalouter layer of the impervious material separated out of the solution andsimultaneously draining off the separated liquid from ust within andsubstantially along the entire length of the impervious outercylindrical layer as it builds up.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribin witnesses.

ANDY A. BRYSDN.

Witnesses:

M. K. BUSKIN, H. A. KEARNS.

and solid from just

